The RPG FS-Z 220 | 3593.3250.02 from Radiometer Physics GmbH is a Spectrum Analyzer Extender with Operating Frequency 140 to 220 GHz, LO Frequency 8.72 to 13.72 GHz, Conversion Loss 32 dB. More details for RPG FS-Z 220 | 3593.3250.02 can be seen below.